Enabling unstable features only for parts of a crate?

language design
1

Using unstable features when using nightly is easy enough. But that feature is then enabled for the whole crate.

I would like to enable non-lexical lifetimes. But only for a small part of the code, as there are cases in which using it will lead to ICEs atm.

However I’m not sure that:

  1. Enabling unstable features can be done at all atm for part of a crate, e.g. using regular #[] attributes and
  2. Even if it can, would such a thing even be possible for something as invasive as non-lexical lifetimes?
2 Likes
2

Currently, you can’t do that, and I would see that as an extreme edge case. If you absolutely must, you can factor the parts out into helper crate and activate NLL there.

3

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